* {
	margin: 0;
	padding: 0;
	list-style: none;
}

.box1 {
	width: 300px;
	height: 300px;
	border: 1px solid palegreen;
	margin: 50px auto;
	position: relative;
}

.box1 .tab input {
	width: 100px;
	height: 30px;
	float: left;
	border: none;
	outline: none;
	cursor: pointer;
}

.clearfix:after {
	display: block;
	clear: both;
	content: '';
}

.box1 ul li {
	width: 300px;
	height: 270px;
	background-color: plum;
	text-align: center;
	line-height: 270px;
	color: gray;
	font-size: 25px;
	display: none;
}
.box1 .qiehuan{
	width: 300px;
	height: 50px;
	position:absolute;top: 50%;
	left: 0;
	margin-top: -25px;
	font-size: 50px;
	color: gray;
	cursor: pointer;
}

.box1 .qiehuan span:nth-of-type(2){
	float: right;
}
.active {
	background: palegreen;
	color: darkcyan;
}

.box1 .show {
	display: block;
}